Relationships Between Sulfur-containing Compound Types in Crude Oil and Causes of Thermochemical Sulphate Reduction in Tazhong Area

doi:10.11885/j.issn.1674-5086.2018.10.27.30

Abstract

Abstract: Various sulfur-containing compounds, such as thiophene, tetrahydrothiophene, benzothiophene dibenzothiophene, and thioadamantane, were detected in crude oil extracted from the Ordovician reservoirs in the Tazhong Area. These compounds differ in their contents and isotopic values for single-atom sulfur. The analysis results show that modifications of crude oil by thermochemical sulphate reduction (TSR) may be the cause of the differences. There is less tetrahydrothiophenes and thioadamantanes in the crude oil not modified by TSR. As crude oil is increasingly modified by TSR, the total dibenzothiophene (DBT) concentration increases. This indicates that DBTs are probably formed during TSR. Meanwhile, non-TSR-modified crude oil samples were compared to highly TSR-modified condensate oil samples from Cambrian reservoirs for their sulfur isotopic values and total thioadamantane concentrations. It was found that TSR can also change the sulfur isotopic values of crude oil. The DBTs and thioadamantanes in the highly TSR-modified crude oil samples have sulfur isotopic values of from 36‰ to 40‰. In contrast, the DBTs in slightly TSR-modified and non-TSR-modified crude oil from Ordovician reservoirs are mainly from cracking of source rocks; thus, their sulfur isotopic values are relatively low (～20‰) near that of kerogen in the Cambrian reservoirs. Thus, it is believed that the crude oil extracted from the Ordovician reservoirs in the Tarim Basin is mainly from Cambrian source rocks and the crude oil with higher organic sulfur isotopic values is mostly caused by TSR modification.

Key words: Tazhong Area, sulfur-containing compound, sulfur isotope, thermochemical sulphate reduction (TSR), Thioadamantane

CLC Number:

TE122

YUAN Yuyang, WANG Tiankai, CAI Chunfang, XU Chenlu, QIN Qirong. Relationships Between Sulfur-containing Compound Types in Crude Oil and Causes of Thermochemical Sulphate Reduction in Tazhong Area[J]. 西南石油大学学报(自然科学版), 2020, 42(2): 48-60.

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